This study aims at discussing several methods to produce aluminum oxide (Al2O3) synthesis along with the advantages and disadvantages of each method used. In general, are available: (1) precipitation, (2) combustion, (3) sol-gel, (4) wet chemical, (5) in supercritical water conditions, (6) microwave, (7) mechanochemical, (8) hydrolysis, most efficient for synthesizing Al2O3 is precipitation bec...

zinc oxide (zno) nanopowders were synthesized by the sol–gel method from an ethanol solution of zinc sulfate heptahydrate in the presence of diethylene glycol surfactant. detailed structural and microstructural investigations were carried out using x-ray diffraction (xrd), high-resolution transmission electron microscopy (hrtem), field emission scanning electron microscopy (fe-sem), fourier tra...

mntio3-zeolite-y nanocomposites were synthesized with 5-10-20% (w/w) of mntio3 by stearic acid gel method. then, the gels were calcined at 900 °c for 4 hours and the resulted spectra were investigated at 20% (w/w) concentration. also, the presence of rhombohedral phase of mntio3 in zeolite-y matrix was confirmed by xrd, sem, edx and bet. the vsm results showed the antiferromagnetic properties f...

This paper considers an approach to design a controller used for the air-to-fuel ratio (AFR) optimization in the combustion process of a power plant boiler. The optimization of the AFR will reduce the excess air level and improve the combustion efficiency in the boiler system. The combustion improvement indicates boiler operating cost savings. The fuzzy logic controller, which is a method of a ...

The purpose of this paper is to investigate combustion characteristics for rotary engine via numerical studies. A 3D numerical model was developed to study the influence of several operative parameters on combustion characteristics. A novel rotary engine called, “Leaf Spring Rotary Engine”, was used to illustrate the structure and principle of the engine. The aims are to (1) improve the underst...

Much energy is lost through excess air flow in and out of process heating equipment. Energy saving opportunities from managing air flow include minimizing combustion air, preheating combustion air, minimizing ventilation air, and reconfiguring openings to reduce leakage. This paper identifies these opportunities and presents methods to quantify potential energy savings from implementing these e...

Nanocrystalline nickel manganite (NiMn2O4) powder with a pure cubic spinel phase structure was synthesized via sol-gel combustion and characterized XRD, FT-IR, XPS SEM. The mixed sodium alginate gel to form nano-biocomposite gel, dried at room temperature thick film FT-IR DC resistance AC impedance of sensor test structures obtained by drop casting the onto interdigitated PdAg electrodes on an ...

Combustion behavior (swelling during combustion and combustion time) of the kraft black liquors varies significantly between pulp mills and also time-dependent variations within a mill occur. In addition, due to the different raw materials and pulping conditions, some further variations in these combustion properties are typically observed. Therefore, by means of the proper process control and ...

Combustion instabilities in gas turbine has been a major setback in the quest for efficient and clean combustion. Accurate characterisation and prediction of these disturbances is required to suppress them either at the design stage or in a close loop control when the system is in operation. The use of flame transfer functions has been a common approach in different literatures. Flame temperatu...

Combustion Theory and Modelling Publication details, including instructions for authors and subscription information: http://www.informaworld.com/smpp/title~content=t713665226 A quantitative method for a priori evaluation of combustion reaction models James C. Sutherland a; Philip J. Smith a; Jacqueline H. Chen b a Department of Chemical & Fuels Engineering, University of Utah, Salt Lake City, ...